Tool numbering and selection (T word) in CNC Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this CNC tool selection code?

Given the CNC code snippet below, what tool number is selected by the command T05 M06?

CNC Programming

N10 T05 M06
N20 G00 X0 Y0 Z0

A Tool number 5 is selected and changed.

B Tool number 6 is selected and changed.

C Tool number 50 is selected and changed.

D No tool is selected; command is invalid.

💡 Hint

The 'T' word followed by a number selects the tool number. 'M06' commands the tool change.

In CNC programming, 'T05' means tool number 5 is selected. 'M06' commands the machine to change to that tool. So the tool selected and changed is number 5.

🧠 Conceptual

intermediate

Understanding tool numbering format in CNC

In CNC programming, what does the tool number T12 typically represent?

A Tool number 12, usually the twelfth tool in the tool magazine.

B Tool number 1 with an offset of 2.

C Tool number 2 with an offset of 1.

D A command to stop the tool.

💡 Hint

Tool numbers usually correspond directly to the number after 'T'.

The 'T' word followed by a number directly indicates the tool number. 'T12' means tool number 12.

📝 Syntax

advanced

Identify the correct tool change command syntax

Which of the following CNC code lines correctly commands a tool change to tool number 3?

A M06 T3

B T03 M06

C T3 M06

D M06 T03

💡 Hint

Tool numbers are usually two digits with leading zero if needed, followed by M06 for tool change.

The correct syntax uses 'T' followed by two digits (leading zero if single digit) and then 'M06' to command the tool change. 'T03 M06' is correct.

🔧 Debug

advanced

Find the error in this tool selection code

What error will this CNC code produce? N10 T5 M06 N20 G00 X10 Y10

A Runtime error because tool 5 does not exist.

B No error; tool 5 is selected and changed.

C Tool change command missing; tool not changed.

D Syntax error due to missing leading zero in tool number.

💡 Hint

Tool numbers usually require two digits with leading zeros.

Many CNC controllers require tool numbers to be two digits with leading zeros, so 'T5' is invalid syntax; it should be 'T05'.

🚀 Application

expert

Determine the final tool number after multiple tool commands

Given the following CNC program snippet, what tool is active after line N40? N10 T01 M06 N20 G00 X0 Y0 N30 T03 N40 M06 N50 G01 X10 Y10

A No tool is active after N40; tool change missing.

B Tool number 1 is still active after N40.

C Tool number 3 is active after N40.

D Tool number 6 is active after N40.

💡 Hint

Tool number must be selected before M06 to change tool.

At N30, tool 3 is selected but not changed yet. At N40, M06 commands the tool change to the last selected tool, which is tool 3. So tool 3 is active after N40.